I ran it with a rigid fork (400mm Crown to Axle) and a suspension fork (420mm) I think it would take a longer fork although how long I don't know. I contacted Rocklobster to find out what fork it was designed to take but he never got back to me.
Just been trawling through the web and found a bloke that had a Rock Lobster the same as the one I'm selling. He was running no problem with 100mm tavel Rock Shox on it. I've attached a picture of his bike to give some idea of what it looks like built up PLEASE NOTE, THIS ISN'T THE ACTUAL BIKE I'M SELLING, BUT IT IS THE SAME MODEL.